[packagekit] development git tree

[Daniel Nicoletti]

> The alternatives are  switching freedesktop.org (which is a pain in the
> neck to get accounts setup)  or github which is free, and accounts are
> quick to setup. Votes more than  welcome.

+1 for github or gitourioous

I think it's very important for us to have just one git where new contributurs
can see all our changes, It's also easier for Packagers that want to backport
fixes.